// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef BASE_TEST_TEST_IO_THREAD_H_
#define BASE_TEST_TEST_IO_THREAD_H_

#include "base/callback_forward.h"
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/task_runner.h"
#include "base/threading/thread.h"
#include "base/time/time.h"

namespace base {

// Create and run an IO thread with a MessageLoop, and
// making the MessageLoop accessible from its client.
// It also provides some ideomatic API like PostTaskAndWait().
class TestIOThread {
public:
    enum Mode { kAutoStart,
        kManualStart };
    explicit TestIOThread(Mode mode);
    // Stops the I/O thread if necessary.
    ~TestIOThread();

    // |Start()|/|Stop()| should only be called from the main (creation) thread.
    // After |Stop()|, |Start()| may be called again to start a new I/O thread.
    // |Stop()| may be called even when the I/O thread is not started.
    void Start();
    void Stop();

    // Post |task| to the IO thread.
    void PostTask(const tracked_objects::Location& from_here,
        const base::Closure& task);
    // Posts |task| to the IO-thread with an WaitableEvent associated blocks on
    // it until the posted |task| is executed, then returns.
    void PostTaskAndWait(const tracked_objects::Location& from_here,
        const base::Closure& task);

    base::MessageLoopForIO* message_loop()
    {
        return static_cast<base::MessageLoopForIO*>(io_thread_.message_loop());
    }

    scoped_refptr<SingleThreadTaskRunner> task_runner()
    {
        return message_loop()->task_runner();
    }

private:
    base::Thread io_thread_;
    bool io_thread_started_;

    DISALLOW_COPY_AND_ASSIGN(TestIOThread);
};

} // namespace base

#endif // BASE_TEST_TEST_IO_THREAD_H_
